<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="answerblank">
        <span id="title">试题</span>
        <li style="list-style: none;"><input type="radio" value="A" name="option"><span id="choice-a"></span></input>
        </li>
        <li style="list-style: none;"><input type="radio" value="B" name="option"><span id="choice-b"></span></input>
        </li>
        <li style="list-style: none;"><input type="radio" value="C" name="option"><span id="choice-c"></span></input>
        </li>
        <li style="list-style: none;"><input type="radio" value="D" name="option"><span id="choice-d"></span></input>
        </li>
        <button id="prev" onclick="prev()">上一题</button>
        <button id="next" onclick="next()">下一题</button>
        <button onclick="submit()">交卷</button>
    </div>
</body>
<script src="sample.js"></script>

</html>